Probst



(No Model.) I D. 'SIDERSKY 8v H. PROBST.

PROCESS 0F OBTAINING GARBONATE 0F STRONTIUM.

'Patented May 22,1883.

No. 278,283.v

N. Pneus. vlmmumogmpher. whingmn. 0.a

PROCESS OF OBTAlNlNG C GERMANY.

ARBONATE OF STRONTIUM.

` Application filed August 14, 1882.

LTO all whom it may concern:

- Beit known that we,DAV1D SInERsKY,a y subject of the Emperor of Russia, and HER- l MANN Paons'r, a subject of the King of Prus- "sia, residing at Rositz, Germany, have in- `vented certain new and useful Improvements in the Process of Obtaining Carbonate of Strontium from the ltesidu'a in the Manufacture of Sugar by Strontianite, and in Appara-` tus therefor; and we do hereby declare the following to be a full,`clear, and exact description of the invention, such as will enable othl ers skilled inthe art to which it appertains to i make and use the same, reference being had to the accompanying drawing, and to theletters of reference marked `thereon, which forms a ipart of this specification.

. Our inventionconsists in a novel process of and apparatus for recovering the strontium `from the residues or precipitates obtained in y y the separation ot' sugar from saccharine solu- "Nions by means of strontianite,substantially as `hereinafter fully described, and specifically y pointed out in the claims. l l

y In the operation of slakng the calcined strontianite for the purpose ofobtainingfcausl tie-strontium erystalsa slime-like residue is obf tained, which yet contains, besides large'masses of marl and lime, a considerable quantity of strontium. The recovery ofthe strontium from these residues has heretofore been incomplete, `the method resorted to being to form the resi 1 dues into bricks or blocks, and, after drying the y same again, calcining and vslaking the burned bricks whereby a certain proportion only of l i the strontium is recovered, a second residue i y being obtained by this operation from which it is impossible to recover the strontium by a is repetition ofthe process.

` i `By means of our improved `process and ap- ,l paratus the strontium is recovered from the `residues or precipitates in the form of pure carbonate of strontium. y Thelaceoinpanying drawing illustrates the apparatus for carrying out our process by a verticalfsection.

Q The residues or precipitates, whether iirst or second,resulting from the process of treatment oi! saccharne solutions with strontianite are fed by a large pipe, l, (preferably provided SPECIFICATION forming' part pf' Letters Patent No. 278,283, dated lVlay*` 22, 1883.

(No model.) Patented in ngland July 20, 1832, No. 3,609, and in Belgium July 2l), 1882, No. 58,610.

hopper, H, and from the latter these residues pass between feed and crushing rolls RR to a tank, T, in which they are boiled for a few minutes With an excess oi' hydrochloric acid. whereby the whole of the strontium contained in the residue is dissolved. `The acid is fed to l the tank from a vessel, V. The boiling in the tank is effected by means ot a perforated steamcoil, C, arranged on the bottom o f the tank, and above which coil is a layer of filtering inaterial, f, preferably gravel, between two perforated false bottoms or diaphragms, d d'. The filtered strong acid-reacting solution is conveyed from the tank T by a pipe, 2, provided with a stopcock, S, and the branch pipvs 3, provided with stop-cocks S S', to one or the other ot' the two tanks T T2, each ot' which is provided with a perforated steam-coil, G', and stirrers or agitators AAZ, ot' any suitable or preferred construction. Each tank T T2 has also -a rotatable si phoupipe, P PZ, iilled with asbestos, by means of which the liquid contents ofthe tank are drawn oft. The acid. so lutions, while being agitated, are decomposed 75 in the ta'nk by means of suitably-diluted sulphuric acid, whereby the strontium only is obtained as a tine pulverulent precipitate in the form of sulphate of strontium, all the rest remaining in solution. This solution is drawn oft' from the tank by means ot' a siphon, and the precipitate is washed in water, and, after" removal of the water by decantation, is boiled in the same tank in a solution of carbonate ot' soda or potash, or, what is still cheaper, in a 8 suitably-concentrate'd lye of beet-root ashes, whereby the sulphate of strontium is converted into carbonate of strontium held in suspension in a solution of sodium or potassium sulphate, from which it is separated by au exhaust -tilter, F, or any other suitable tlteringappliances, The boiling of theprecipitate in the tank is effected by means ot' steam conveyed thereto through the perforated coil C. y

We would remark that care should "be had not to use an excess of sulphuric acid; otherwise gypsum would be formed; and should this happen by accident or carelessness on the par-t of the workmen, we add a warm solution of carbonate of ammonia to dissolve the gypsum.

Ibo

,y y with means to catch or trap` the stones,)fto a In case the residues should contain iron, we`

,- phuric acid'liberated during the firstoperation in tank T can be further utilized.

'eliminate the same,with the marl, by the addisels V2, V3, and V4, respectively. The pipes 4,

5, and o, leading from the vessels V2 V3 V4,

. respectively, have each two branch pipes-one connected with tank T', the other with tank T2, said branch pipes being provided with suitable stop-cocks, S', S5, andSU, whereby either of said tanks may be connected with said vessels independent-ly ofthe other. Each vessel or reservoir V V' V2 V3 V1 is provided with a measuring gage, s s' s2 s3 s4, respectively,

. to enable the workmen to supply the tanks T T' .T2 with the necessary quantities ot' hydrochloric acid, ammonia, ca rbonatc of ammonia, sulphuric acid, and soda solution or its equivv aient.

It is evident that one tank T' or T2 may be employed, it' desired. To make the operation a continuous one, we, however, prefer to cmploy two tanks, as described, so that the solution from tank T may be fed to tank T2 and treated While aquantity of said solution is being treated in tank T'.

It also'is evident that any other suitable construction of apparatus than that shown may be used to carry out our process; yet We prefer the construction of apparatus as shown and described.

Having now described our invention, what We claimis- Y 1. The herein-described process ot'recovcring the strontium salts from the residues or precipitates resulting from thc treatment of 40 saccharine solutions with strontium in the manufacture ofsugar,\vhich consists in dissolving the strontianite in said residues, filtering off the strontium solution, converting the strontium in the filtered solution into a sulphate, and finally reconverting the sulphate into a carbonate, substantially as described.

2. The herein-described apparatus, consist ing in the combination, with the tank T, having iilterfand steam-coil C, the tank T', having steam-coil C', a Siphon, and suitabie agi tating devices, said tanks being connected to-.

gether by a valved pipe, of the vessels V V' V2 V3 V4, the vessels V V' being connected with tank T, and those V2 V3 V* with tank T', by suitable valved pipes, substantially7 asand for the purposes specitied.

3. The combination, with the tankT and the vessels V V', of the tanks T' T2 and vessels V2 V3 V4, all constructed and arranged for co-operation substantially as shown and described.

v4. The combination, with the crushing` and feeding rolls It lt, the tank T, and vessels V V', ofthe tanks T T2, vessels V2 V3 V4, and their valved communicating pipes et, 5, and 6, hav ing stop-cocks s4, S5, and s6, and a filtering apparatus, all constructed and arranged for coopera-tion substantially as shown and described, t'or the purposes specified.

In testimony Whcreofwe affix our signatures in presence ot two witnesses. DAVID SIDERSKY.

HERMANN PROBST.

Witnesses:

G. LoUBtER, B. Rot. 

